[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / usb-skeleton.c

/*
 * USB Skeleton driver - 2.2
 *
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation, version 2.
 *
 * This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
 * but has been rewritten to be easier to read and use.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/mutex.h>


/* Define these values to match your devices */
#define USB_SKEL_VENDOR_ID	0xfff0
#define USB_SKEL_PRODUCT_ID	0xfff0

/* table of devices that work with this driver */
static struct usb_device_id skel_table [] = {
	{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, skel_table);


/* Get a minor range for your devices from the usb maintainer */
#define USB_SKEL_MINOR_BASE	192

/* our private defines. if this grows any larger, use your own .h file */
#define MAX_TRANSFER		(PAGE_SIZE - 512)
#define WRITES_IN_FLIGHT	8

/* Structure to hold all of our device specific stuff */
struct usb_skel {
	struct usb_device       *dev;			/* the usb device for this device */
	struct usb_interface    *interface;		/* the interface for this device */
	struct semaphore	limit_sem;		/* limiting the number of writes in progress */
	unsigned char           *bulk_in_buffer;	/* the buffer to receive data */
	size_t			bulk_in_size;		/* the size of the receive buffer */
	__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */
	__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */
	struct kref		kref;
	struct mutex		io_mutex;		/* synchronize I/O with disconnect */
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)

static struct usb_driver skel_driver;

static void skel_delete(struct kref *kref)
{
	struct usb_skel *dev = to_skel_dev(kref);

	usb_put_dev(dev->udev);
	kfree(dev->bulk_in_buffer);
	kfree(dev);
}

static int skel_open(struct inode *inode, struct file *file)
{
	struct usb_skel *dev;
	struct usb_interface *interface;
	int subminor;
	int retval = 0;

	subminor = iminor(inode);

	interface = usb_find_interface(&skel_driver, subminor);
	if (!interface) {
		err ("%s - error, can't find device for minor %d",
		     __FUNCTION__, subminor);
		retval = -ENODEV;
		goto exit;
	}

	dev = usb_get_intfdata(interface);
	if (!dev) {
		retval = -ENODEV;
		goto exit;
	}

	/* prevent the device from being autosuspended */
	retval = usb_autopm_get_interface(interface);
	if (retval)
		goto exit;

	/* increment our usage count for the device */
	kref_get(&dev->kref);

	/* save our object in the file's private structure */
	file->private_data = dev;

exit:
	return retval;
}

static int skel_release(struct inode *inode, struct file *file)
{
	struct usb_skel *dev;

	dev = (struct usb_skel *)file->private_data;
	if (dev == NULL)
		return -ENODEV;

	/* allow the device to be autosuspended */
	mutex_lock(&dev->io_mutex);
	if (dev->interface)
		usb_autopm_put_interface(dev->interface);
	mutex_unlock(&dev->io_mutex);

	/* decrement the count on our device */
	kref_put(&dev->kref, skel_delete);
	return 0;
}

static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
	struct usb_skel *dev;
	int retval;
	int bytes_read;

	dev = (struct usb_skel *)file->private_data;

	mutex_lock(&dev->io_mutex);
	if (!dev->interface) {		/* disconnect() was called */
		retval = -ENODEV;
		goto exit;
	}

	/* do a blocking bulk read to get data from the device */
	retval = usb_bulk_msg(dev->udev,
			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
			      dev->bulk_in_buffer,
			      min(dev->bulk_in_size, count),
			      &bytes_read, 10000);

	/* if the read was successful, copy the data to userspace */
	if (!retval) {
		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
			retval = -EFAULT;
		else
			retval = bytes_read;
	}

exit:
	mutex_unlock(&dev->io_mutex);
	return retval;
}

static void skel_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
	struct usb_skel *dev;

	dev = (struct usb_skel *)urb->context;

	/* sync/async unlink faults aren't errors */
	if (urb->status &&
	    !(urb->status == -ENOENT ||
	      urb->status == -ECONNRESET ||
	      urb->status == -ESHUTDOWN)) {
		err("%s - nonzero write bulk status received: %d",
		    __FUNCTION__, urb->status);
	}

	/* free up our allocated buffer */
	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
			urb->transfer_buffer, urb->transfer_dma);
	up(&dev->limit_sem);
}

static ssize_t skel_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
{
	struct usb_skel *dev;
	int retval = 0;
	struct urb *urb = NULL;
	char *buf = NULL;
	size_t writesize = min(count, (size_t)MAX_TRANSFER);

	dev = (struct usb_skel *)file->private_data;

	/* verify that we actually have some data to write */
	if (count == 0)
		goto exit;

	/* limit the number of URBs in flight to stop a user from using up all RAM */
	if (down_interruptible(&dev->limit_sem)) {
		retval = -ERESTARTSYS;
		goto exit;
	}

	mutex_lock(&dev->io_mutex);
	if (!dev->interface) {		/* disconnect() was called */
		retval = -ENODEV;
		goto error;
	}

	/* create a urb, and a buffer for it, and copy the data to the urb */
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		retval = -ENOMEM;
		goto error;
	}

	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
	if (!buf) {
		retval = -ENOMEM;
		goto error;
	}

	if (copy_from_user(buf, user_buffer, writesize)) {
		retval = -EFAULT;
		goto error;
	}

	/* initialize the urb properly */
	usb_fill_bulk_urb(urb, dev->udev,
			  usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
			  buf, writesize, skel_write_bulk_callback, dev);
	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* send the data out the bulk port */
	retval = usb_submit_urb(urb, GFP_KERNEL);
	if (retval) {
		err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
		goto error;
	}

	/* release our reference to this urb, the USB core will eventually free it entirely */
	usb_free_urb(urb);

	mutex_unlock(&dev->io_mutex);
	return writesize;

error:
	if (urb) {
		usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
		usb_free_urb(urb);
	}
	mutex_unlock(&dev->io_mutex);
	up(&dev->limit_sem);

exit:
	return retval;
}

static const struct file_operations skel_fops = {
	.owner =	THIS_MODULE,
	.read =		skel_read,
	.write =	skel_write,
	.open =		skel_open,
	.release =	skel_release,
};

/*
 * usb class driver info in order to get a minor number from the usb core,
 * and to have the device registered with the driver core
 */
static struct usb_class_driver skel_class = {
	.name =		"skel%d",
	.fops =		&skel_fops,
	.minor_base =	USB_SKEL_MINOR_BASE,
};

static int skel_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
	struct usb_skel *dev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	size_t buffer_size;
	int i;
	int retval = -ENOMEM;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		err("Out of memory");
		goto error;
	}
	kref_init(&dev->kref);
	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
	mutex_init(&dev->io_mutex);

	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	dev->interface = interface;

	/* set up the endpoint information */
	/* use only the first bulk-in and bulk-out endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		if (!dev->bulk_in_endpointAddr &&
		    usb_endpoint_is_bulk_in(endpoint)) {
			/* we found a bulk in endpoint */
			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
			dev->bulk_in_size = buffer_size;
			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
			dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
			if (!dev->bulk_in_buffer) {
				err("Could not allocate bulk_in_buffer");
				goto error;
			}
		}

		if (!dev->bulk_out_endpointAddr &&
		    usb_endpoint_is_bulk_out(endpoint)) {
			/* we found a bulk out endpoint */
			dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
		}
	}
	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
		err("Could not find both bulk-in and bulk-out endpoints");
		goto error;
	}

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, dev);

	/* we can register the device now, as it is ready */
	retval = usb_register_dev(interface, &skel_class);
	if (retval) {
		/* something prevented us from registering this driver */
		err("Not able to get a minor for this device.");
		usb_set_intfdata(interface, NULL);
		goto error;
	}

	/* let the user know what node this device is now attached to */
	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	return 0;

error:
	if (dev)
		kref_put(&dev->kref, skel_delete);
	return retval;
}

static void skel_disconnect(struct usb_interface *interface)
{
	struct usb_skel *dev;
	int minor = interface->minor;

	/* prevent skel_open() from racing skel_disconnect() */
	lock_kernel();

	dev = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	/* give back our minor */
	usb_deregister_dev(interface, &skel_class);

	/* prevent more I/O from starting */
	mutex_lock(&dev->io_mutex);
	dev->interface = NULL;
	mutex_unlock(&dev->io_mutex);

	unlock_kernel();

	/* decrement our usage count */
	kref_put(&dev->kref, skel_delete);

	info("USB Skeleton #%d now disconnected", minor);
}

static struct usb_driver skel_driver = {
	.name =		"skeleton",
	.probe =	skel_probe,
	.disconnect =	skel_disconnect,
	.id_table =	skel_table,
};

static int __init usb_skel_init(void)
{
	int result;

	/* register this driver with the USB subsystem */
	result = usb_register(&skel_driver);
	if (result)
		err("usb_register failed. Error number %d", result);

	return result;
}

static void __exit usb_skel_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&skel_driver);
}

module_init(usb_skel_init);
module_exit(usb_skel_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
c0704541	2	* USB Skeleton driver - 2.2
1da177e4 LT	3	*
	4	* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2.
	9	*
c0704541	10	* This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
121e287c	11	* but has been rewritten to be easier to read and use.
1da177e4 LT	12	*
	13	*/
	14
1da177e4 LT	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <linux/module.h>
	20	#include <linux/kref.h>
	21	#include <asm/uaccess.h>
	22	#include <linux/usb.h>
121e287c	23	#include <linux/mutex.h>
1da177e4 LT	24
	25
	26	/* Define these values to match your devices */
	27	#define USB_SKEL_VENDOR_ID 0xfff0
	28	#define USB_SKEL_PRODUCT_ID 0xfff0
	29
	30	/* table of devices that work with this driver */
	31	static struct usb_device_id skel_table [] = {
	32	{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
	33	{ } /* Terminating entry */
	34	};
c0704541	35	MODULE_DEVICE_TABLE(usb, skel_table);
1da177e4 LT	36
	37
	38	/* Get a minor range for your devices from the usb maintainer */
	39	#define USB_SKEL_MINOR_BASE 192
	40
ff906518	41	/* our private defines. if this grows any larger, use your own .h file */
c0704541	42	#define MAX_TRANSFER (PAGE_SIZE - 512)
ff906518 ON	43	#define WRITES_IN_FLIGHT 8
ff906518 ON	44
1da177e4 LT	45	/* Structure to hold all of our device specific stuff */
1da177e4 LT	46	struct usb_skel {
c0704541 LFC	47	struct usb_device dev; / the usb device for this device */
c0704541 LFC	48	struct usb_interface interface; / the interface for this device */
ff906518	49	struct semaphore limit_sem; /* limiting the number of writes in progress */
c0704541	50	unsigned char bulk_in_buffer; / the buffer to receive data */
1da177e4 LT	51	size_t bulk_in_size; /* the size of the receive buffer */
	52	__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
	53	__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
	54	struct kref kref;
121e287c	55	struct mutex io_mutex; /* synchronize I/O with disconnect */
1da177e4 LT	56	};
	57	#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
	58
	59	static struct usb_driver skel_driver;
	60
	61	static void skel_delete(struct kref *kref)
c0704541	62	{
1da177e4 LT	63	struct usb_skel *dev = to_skel_dev(kref);
	64
	65	usb_put_dev(dev->udev);
c0704541 LFC	66	kfree(dev->bulk_in_buffer);
c0704541 LFC	67	kfree(dev);
1da177e4 LT	68	}
	69
	70	static int skel_open(struct inode inode, struct file file)
	71	{
	72	struct usb_skel *dev;
	73	struct usb_interface *interface;
	74	int subminor;
	75	int retval = 0;
	76
	77	subminor = iminor(inode);
	78
	79	interface = usb_find_interface(&skel_driver, subminor);
	80	if (!interface) {
	81	err ("%s - error, can't find device for minor %d",
	82	__FUNCTION__, subminor);
	83	retval = -ENODEV;
	84	goto exit;
	85	}
	86
	87	dev = usb_get_intfdata(interface);
	88	if (!dev) {
	89	retval = -ENODEV;
	90	goto exit;
	91	}
	92
01d883d4 AS	93	/* prevent the device from being autosuspended */
	94	retval = usb_autopm_get_interface(interface);
	95	if (retval)
	96	goto exit;
	97
1da177e4 LT	98	/* increment our usage count for the device */
	99	kref_get(&dev->kref);
	100
	101	/* save our object in the file's private structure */
	102	file->private_data = dev;
	103
	104	exit:
	105	return retval;
	106	}
	107
	108	static int skel_release(struct inode inode, struct file file)
	109	{
	110	struct usb_skel *dev;
	111
	112	dev = (struct usb_skel *)file->private_data;
	113	if (dev == NULL)
	114	return -ENODEV;
	115
01d883d4 AS	116	/* allow the device to be autosuspended */
	117	mutex_lock(&dev->io_mutex);
	118	if (dev->interface)
	119	usb_autopm_put_interface(dev->interface);
	120	mutex_unlock(&dev->io_mutex);
	121
1da177e4 LT	122	/* decrement the count on our device */
	123	kref_put(&dev->kref, skel_delete);
	124	return 0;
	125	}
	126
	127	static ssize_t skel_read(struct file file, char buffer, size_t count, loff_t *ppos)
	128	{
	129	struct usb_skel *dev;
c0704541	130	int retval;
1da177e4 LT	131	int bytes_read;
	132
	133	dev = (struct usb_skel *)file->private_data;
121e287c AS	134
	135	mutex_lock(&dev->io_mutex);
	136	if (!dev->interface) { /* disconnect() was called */
	137	retval = -ENODEV;
	138	goto exit;
	139	}
	140
1da177e4 LT	141	/* do a blocking bulk read to get data from the device */
	142	retval = usb_bulk_msg(dev->udev,
	143	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
	144	dev->bulk_in_buffer,
	145	min(dev->bulk_in_size, count),
	146	&bytes_read, 10000);
	147
	148	/* if the read was successful, copy the data to userspace */
	149	if (!retval) {
	150	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
	151	retval = -EFAULT;
	152	else
	153	retval = bytes_read;
	154	}
	155
121e287c AS	156	exit:
121e287c AS	157	mutex_unlock(&dev->io_mutex);
1da177e4 LT	158	return retval;
	159	}
	160
	161	static void skel_write_bulk_callback(struct urb urb, struct pt_regs regs)
	162	{
	163	struct usb_skel *dev;
	164
	165	dev = (struct usb_skel *)urb->context;
	166
	167	/* sync/async unlink faults aren't errors */
c0704541 LFC	168	if (urb->status &&
c0704541 LFC	169	!(urb->status == -ENOENT \|\|
1da177e4 LT	170	urb->status == -ECONNRESET \|\|
1da177e4 LT	171	urb->status == -ESHUTDOWN)) {
c0704541	172	err("%s - nonzero write bulk status received: %d",
1da177e4 LT	173	__FUNCTION__, urb->status);
	174	}
	175
	176	/* free up our allocated buffer */
c0704541	177	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
1da177e4	178	urb->transfer_buffer, urb->transfer_dma);
ff906518	179	up(&dev->limit_sem);
1da177e4 LT	180	}
	181
	182	static ssize_t skel_write(struct file file, const char user_buffer, size_t count, loff_t *ppos)
	183	{
	184	struct usb_skel *dev;
	185	int retval = 0;
	186	struct urb *urb = NULL;
	187	char *buf = NULL;
c8dd7709	188	size_t writesize = min(count, (size_t)MAX_TRANSFER);
1da177e4 LT	189
	190	dev = (struct usb_skel *)file->private_data;
	191
	192	/* verify that we actually have some data to write */
	193	if (count == 0)
	194	goto exit;
	195
ff906518	196	/* limit the number of URBs in flight to stop a user from using up all RAM */
c8dd7709 SB	197	if (down_interruptible(&dev->limit_sem)) {
	198	retval = -ERESTARTSYS;
	199	goto exit;
	200	}
ff906518	201
121e287c AS	202	mutex_lock(&dev->io_mutex);
	203	if (!dev->interface) { /* disconnect() was called */
	204	retval = -ENODEV;
	205	goto error;
	206	}
	207
1da177e4 LT	208	/* create a urb, and a buffer for it, and copy the data to the urb */
	209	urb = usb_alloc_urb(0, GFP_KERNEL);
	210	if (!urb) {
	211	retval = -ENOMEM;
	212	goto error;
	213	}
	214
ff906518	215	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
1da177e4 LT	216	if (!buf) {
	217	retval = -ENOMEM;
	218	goto error;
	219	}
	220
ff906518	221	if (copy_from_user(buf, user_buffer, writesize)) {
1da177e4 LT	222	retval = -EFAULT;
	223	goto error;
	224	}
	225
	226	/* initialize the urb properly */
	227	usb_fill_bulk_urb(urb, dev->udev,
	228	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
ff906518	229	buf, writesize, skel_write_bulk_callback, dev);
1da177e4 LT	230	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	231
	232	/* send the data out the bulk port */
	233	retval = usb_submit_urb(urb, GFP_KERNEL);
	234	if (retval) {
	235	err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
	236	goto error;
	237	}
	238
	239	/* release our reference to this urb, the USB core will eventually free it entirely */
	240	usb_free_urb(urb);
	241
121e287c	242	mutex_unlock(&dev->io_mutex);
ff906518	243	return writesize;
1da177e4 LT	244
1da177e4 LT	245	error:
121e287c AS	246	if (urb) {
	247	usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
	248	usb_free_urb(urb);
	249	}
	250	mutex_unlock(&dev->io_mutex);
ff906518	251	up(&dev->limit_sem);
121e287c AS	252
121e287c AS	253	exit:
1da177e4 LT	254	return retval;
	255	}
	256
066202dd	257	static const struct file_operations skel_fops = {
1da177e4 LT	258	.owner = THIS_MODULE,
	259	.read = skel_read,
	260	.write = skel_write,
	261	.open = skel_open,
	262	.release = skel_release,
	263	};
	264
c0704541	265	/*
1da177e4	266	* usb class driver info in order to get a minor number from the usb core,
595b14cb	267	* and to have the device registered with the driver core
1da177e4 LT	268	*/
1da177e4 LT	269	static struct usb_class_driver skel_class = {
d6e5bcf4	270	.name = "skel%d",
1da177e4	271	.fops = &skel_fops,
1da177e4 LT	272	.minor_base = USB_SKEL_MINOR_BASE,
	273	};
	274
	275	static int skel_probe(struct usb_interface interface, const struct usb_device_id id)
	276	{
c0704541	277	struct usb_skel *dev;
1da177e4 LT	278	struct usb_host_interface *iface_desc;
	279	struct usb_endpoint_descriptor *endpoint;
	280	size_t buffer_size;
	281	int i;
	282	int retval = -ENOMEM;
	283
	284	/* allocate memory for our device state and initialize it */
ff906518	285	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
c0704541	286	if (!dev) {
1da177e4 LT	287	err("Out of memory");
	288	goto error;
	289	}
1da177e4	290	kref_init(&dev->kref);
ff906518	291	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
121e287c	292	mutex_init(&dev->io_mutex);
1da177e4 LT	293
	294	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	295	dev->interface = interface;
	296
	297	/* set up the endpoint information */
	298	/* use only the first bulk-in and bulk-out endpoints */
	299	iface_desc = interface->cur_altsetting;
	300	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	301	endpoint = &iface_desc->endpoint[i].desc;
	302
	303	if (!dev->bulk_in_endpointAddr &&
c0704541	304	usb_endpoint_is_bulk_in(endpoint)) {
1da177e4 LT	305	/* we found a bulk in endpoint */
	306	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	307	dev->bulk_in_size = buffer_size;
	308	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	309	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	310	if (!dev->bulk_in_buffer) {
	311	err("Could not allocate bulk_in_buffer");
	312	goto error;
	313	}
	314	}
	315
	316	if (!dev->bulk_out_endpointAddr &&
c0704541	317	usb_endpoint_is_bulk_out(endpoint)) {
1da177e4 LT	318	/* we found a bulk out endpoint */
	319	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	320	}
	321	}
	322	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	323	err("Could not find both bulk-in and bulk-out endpoints");
	324	goto error;
	325	}
	326
	327	/* save our data pointer in this interface device */
	328	usb_set_intfdata(interface, dev);
	329
	330	/* we can register the device now, as it is ready */
	331	retval = usb_register_dev(interface, &skel_class);
	332	if (retval) {
	333	/* something prevented us from registering this driver */
	334	err("Not able to get a minor for this device.");
	335	usb_set_intfdata(interface, NULL);
	336	goto error;
	337	}
	338
	339	/* let the user know what node this device is now attached to */
	340	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	341	return 0;
	342
	343	error:
	344	if (dev)
	345	kref_put(&dev->kref, skel_delete);
	346	return retval;
	347	}
	348
	349	static void skel_disconnect(struct usb_interface *interface)
	350	{
	351	struct usb_skel *dev;
	352	int minor = interface->minor;
	353
	354	/* prevent skel_open() from racing skel_disconnect() */
	355	lock_kernel();
	356
	357	dev = usb_get_intfdata(interface);
	358	usb_set_intfdata(interface, NULL);
	359
	360	/* give back our minor */
	361	usb_deregister_dev(interface, &skel_class);
	362
121e287c AS	363	/* prevent more I/O from starting */
	364	mutex_lock(&dev->io_mutex);
	365	dev->interface = NULL;
	366	mutex_unlock(&dev->io_mutex);
	367
1da177e4 LT	368	unlock_kernel();
	369
	370	/* decrement our usage count */
	371	kref_put(&dev->kref, skel_delete);
	372
	373	info("USB Skeleton #%d now disconnected", minor);
	374	}
	375
	376	static struct usb_driver skel_driver = {
1da177e4 LT	377	.name = "skeleton",
	378	.probe = skel_probe,
	379	.disconnect = skel_disconnect,
	380	.id_table = skel_table,
	381	};
	382
	383	static int __init usb_skel_init(void)
	384	{
	385	int result;
	386
	387	/* register this driver with the USB subsystem */
	388	result = usb_register(&skel_driver);
	389	if (result)
	390	err("usb_register failed. Error number %d", result);
	391
	392	return result;
	393	}
	394
	395	static void __exit usb_skel_exit(void)
	396	{
	397	/* deregister this driver with the USB subsystem */
	398	usb_deregister(&skel_driver);
	399	}
	400
c0704541 LFC	401	module_init(usb_skel_init);
c0704541 LFC	402	module_exit(usb_skel_exit);
1da177e4 LT	403
1da177e4 LT	404	MODULE_LICENSE("GPL");